check engine light comes on when down to 1/4 tank and goes off at 3/4 tank. Also Revs very high.

jorf
0

Asked by Dec 13, 2008 at 02:28 PM about the 2003 Chevrolet TrailBlazer LT

Question type: Maintenance & Repair

I have a chevy trailblazer that the check engine light comes on when down to around 1/4 tank of gas and then after refuel goes off when it is 3/4 tank full.  It also revs very high while driving, then it goes back to normal.  Any ideas?

5 Answers

Danny Wang
4,065

given that you mention the high rev while driving and variations in fuel tank levels my guess, but I am not positive, may have to deal with something in the evaporative emission system

1 out of 1 people think this is helpful.
Adam Morgan
7,055

If the light is staying on until you fill back up, then stop by a parts store and get the code read...

1 out of 1 people think this is helpful.
SanJoseTJK
20

Replace the fuel level sender in the fuel tank. A common wear out item on many vehicles. Had to do this on my friends 06 trailblazer and my wife's Isuzu Rodeo. True fix.

2 out of 2 people think this is helpful.
Bruce Klug
275

make sure your gas cap is tight. If that doesnt work, buy a new one.

Timothy Kirchofer
135

Yes SanJoseTJK is likely right , the fuel level sensor id a vasriable resistor and likely has a worn out section where resistance is lost on the circuit when the fuel level reaches that level the vehicle requires a fuel level check before the vehicle computer (ECM) can run certain diagnostic tests ,when it runs the test and can not get a signal it turns on the check engine light and sets a DTC you need a code reader to be sure but will likley find 1 or more codes set for the fuel system

1 out of 1 people think this is helpful.

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